Grasberg Gold & Copper Mine
It is the largest gold mine and the third largest copper mine in the world.
|
Grasberg Gold & Copper Mine |
Location: Papua,
Indonesia.
Products: Gold
& Copper.
Owner: Freeport-McMoRan.
Deposit Type: Porphyry deposits associated with the 3.2
to 2.7 Ma Grasberg Igneous Complex, porphyry ores of the 4.4 to 3.0 Ma Ertsberg
Diorite 2.5 km to the south, and a series of skarns deposits.Together
these deposits account for near 80 Mt of copper and around 3900 tonnes of
gold (including inferred resources).
Mineralization: Mineralisation
associated with the Ertsberg
intrusive includes: The Ertsberg
stockwork
which contained a resource of 122 Mt @ 0.54% Cu, 0.90 g/t Au in 2005.The
skarn
mineralisation,
which includes the: i). GB
(Gunung
Bijah)
- 33 Mt @ 2.5% Cu, 0.8 g/t Au (the original reserve on which mining in the
district was commenced), which is surrounded by Ertsberg
Diorite near its NW margin; ii). GBT
Complex (the vertically stacked GBT, IOZ & DOZ), 1.5 km east of GB on the
northern contact, with reserves of >230 Mt @ 1% Cu, 0.8 g/t Au, iii). Dom Skarn,
0.5 km south of GBT, partially enclosed by the intrusive near its SE margin,
with >70 Mt @ 1.4% Cu, 0.4 g/t Au, iv). Big Gossan
within a fault zone cutting sediments to the west of the Ertsberg
Diorite with 33 Mt @ 2.81% Cu, 1 g/t Au, v). Kucing
Liar (dated at 3.42 Ma, the oldest mineralisation
in the district, predating the Dalam
Diorite) is associated with a fault zone between the two intrusive complexes,
but close to the Grasberg complex, contains >225 Mt @ 1.42% Cu, 1.57 g/t
Au.
|
Block diagram showing the Grasberg Igneous Complex and zoned alteration. Weak stockwork and potassic alteration associated with South Kali Dikes are not shown. |
0 التعليقات:
Post a Comment